Question

The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of : 

(1) 600 – 750 nm 

(2) 0.8 – 1.5 nm 

(3) 400 – 550 nm 

(4) 200 – 315 nm

Answer 1

Correct option:  (4) 200 – 315 nm

Explanation:

The upper stratosphere consists of considerable amount of ozone (O₃), which protects us from the harmful ultraviolet (UV) radiations (λ = 255 nm) coming from the sun.